[ http://issues.apache.org/jira/browse/NUTCH-258?page=all ]
Chris A. Mattmann reopened NUTCH-258:
-------------------------------------
Assign To: Chris A. Mattmann
Issue found to in fact be a real issue with the Fetcher: here's the proposed
solution:
* add flag field (preferably a public static final short String) in
Configuration instance to signify whether or not a
SEVERE error has been logged within a task's context
* check this field within the fetcher to determine whether or not to stop
the fetcher, just for that fetching task identified by its Configuration
(and no others)
> Once Nutch logs a SEVERE log item, Nutch fails forevermore
> ----------------------------------------------------------
>
> Key: NUTCH-258
> URL: http://issues.apache.org/jira/browse/NUTCH-258
> Project: Nutch
> Type: Bug
> Components: fetcher
> Versions: 0.8-dev
> Environment: All
> Reporter: Scott Ganyo
> Assignee: Chris A. Mattmann
> Priority: Critical
> Attachments: dumbfix.patch
>
> Once a SEVERE log item is written, Nutch shuts down any fetching forevermore.
> This is from the run() method in Fetcher.java:
> public void run() {
> synchronized (Fetcher.this) {activeThreads++;} // count threads
>
> try {
> UTF8 key = new UTF8();
> CrawlDatum datum = new CrawlDatum();
>
> while (true) {
> if (LogFormatter.hasLoggedSevere()) // something bad happened
> break; // exit
>
> Notice the last 2 lines. This will prevent Nutch from ever Fetching again
> once this is hit as LogFormatter is storing this data as a static.
> (Also note that "LogFormatter.hasLoggedSevere()" is also checked in
> org.apache.nutch.net.URLFilterChecker and will disable this class as well.)
> This must be fixed or Nutch cannot be run as any kind of long-running
> service. Furthermore, I believe it is a poor decision to rely on a logging
> event to determine the state of the application - this could have any number
> of side-effects that would be extremely difficult to track down. (As it has
> already for me.)
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